Curb gem not getting installed


I am trying to install curb on my windows machine. I went through a few
pages directing to install it. I installed curl-7.19.6 binary and
the path in the environment variables. I can now use the curl command
Then I went on to installing curb using the gem install curb.

It gave me the following error.

C:\Documents and Settings\Administrator\Desktop>gem install curb
Building native extensions. This could take a while…
ERROR: Error installing curb:
ERROR: Failed to build gem native extension.

C:/Ruby/bin/ruby.exe extconf.rb install curb
checking for curl-config… no
checking for main() in curl.lib… no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
extconf.rb:12: Can’t find libcurl or curl/curl.h (RuntimeError)

Try passing --with-curl-dir or --with-curl-lib and --with-curl-include
options to extconf.

Gem files will remain installed in
C:/Ruby/lib/ruby/gems/1.8/gems/curb- f
or inspection.
Results logged to

The path of curl folder is under c drive

How do I install curl on my windows machine…

Thank you.